import type { MaybeDate } from "./api.js";
/**
 * Coerces `x` to a native JS `Date` instance.
 *
 * @param x -
 */
export declare const ensureDate: (x: MaybeDate) => Date;
/**
 * Coerces `x` to a timestamp.
 *
 * @param x -
 */
export declare const ensureEpoch: (x: MaybeDate) => number;
export declare const isLeapYear: (year: number) => boolean;
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